Lightweight gradient stiffeners in honeycomb topology

Abstract

The utility model relates to mechanical structure lightweight design technical field, concretely is lightweight gradient reinforcing rib of imitative honeycomb topology structure, including reinforcing rib body, reinforcing rib body includes low stress area of straight line section, with high stress area of bending moment section (turning section), realizes stress distribution optimization and material high -efficient utilization through the design radial and axial double gradient distribution hexagonal honeycomb unit array in the reinforcing rib inside, this structure guarantees the bearing strength while significantly reducing the weight, and adopts the local compact connection section and promotes the structural stability.

Description

Technical Field

[0001] This utility model relates to the field of lightweight mechanical structure design technology, specifically a lightweight gradient reinforcing rib with a honeycomb topology. Background Technology

[0002] Traditional stiffener defects: Homogeneous solid or uniform honeycomb filled stiffeners have problems such as low material utilization, uneven stress distribution, and redundant weight increase in non-critical areas, making it difficult to balance lightweight and load-bearing efficiency.

[0003] At the same time, existing honeycomb structures have certain limitations. Although conventional honeycomb sandwich structures have the advantage of being lightweight, the unit size and wall thickness are constant, which cannot adapt to non-uniform stress fields. High stress areas are prone to failure, while low stress areas are still redundant.

[0004] Therefore, in view of the above-mentioned problems, this technical solution designs a lightweight gradient reinforcing rib with a simulated cellular topology. Utility Model Content

[0005] The purpose of this invention is to provide a lightweight gradient reinforcing rib with a simulated cellular topology to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The lightweight gradient stiffener with a cellular-like topology includes a stiffener body, a metal outer layer covering its outer side, and a hexagonal cellular cell array filling the inner side of the metal outer layer. The stiffener body is divided into a low-stress area and a high-stress area, which are connected by a transition section with an axial gradient distribution. The hexagonal cellular cell array has a cell size that increases from the center to the outside in the radial direction and a cell size that decreases from the high-stress area to the low-stress area in the axial direction.

[0008] As a further embodiment of this utility model: the wall thickness of the hexagonal honeycomb unit in the high-stress zone is 0.3–1.5 mm, and the wall thickness of the unit in the low-stress zone is 0.1–0.3 mm.

[0009] As a further embodiment of this utility model: a dense connecting section is provided at the connection between the reinforcing rib body and the external structure, and the honeycomb unit size is <1mm or degenerated into a solid grid.

[0010] As a further embodiment of this invention: the cell wall connection points of the hexagonal honeycomb unit adopt a rounded transition, and the minimum wall thickness is ≥0.1mm.

[0011] As a further embodiment of this invention, the outer metal layer material is a titanium alloy, a high-strength aluminum alloy, or a metal composite material.

[0012] As a further embodiment of this invention: the hexagonal honeycomb unit has a side length of 0.5–10 mm and its size is adjustable.

[0013] As a further improvement of this invention, the size of the honeycomb cells in the transition section is consistent with that of the adjacent high-stress or low-stress areas.

[0014] Compared with existing technologies, the beneficial effects of this invention are: the cellular topology significantly reduces mass, achieving lightweight design.

[0015] Radial gradient enhances central strength, while axial gradient smoothly transitions between high and low stress zones, increasing stress adaptability.

[0016] By using dense connecting sections, the stability of the connection with the external structure is improved, thereby enhancing the reliability of the connection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the vertical cross-section of a lightweight gradient stiffener in a cellular-like topology.

[0018] Figure 2 This is a schematic diagram of the cross-section of a lightweight gradient stiffener in a cellular-like topology.

[0019] Figure 3 for Figure 1 A magnified structural diagram of A in the diagram.

[0020] The structure includes: 1. Reinforcing rib body; 2. Low stress zone; 3. High stress zone; 4. Dense connection section; 5. Hexagonal honeycomb unit array; 6. Transition section; 7. Metal outer layer; 8. Hexagonal honeycomb unit. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0025] Please see Figures 1-3 The lightweight gradient stiffener with a honeycomb topology includes a stiffener body 1, which includes a low-stress zone 2 in a straight section and a high-stress zone 3 in a bending moment section (turning section). A metal outer layer 7 is provided on the outside of the stiffener body 1. The low-stress zone 2 and the high-stress zone 3 inside the metal outer layer 7 are provided with radially gradient hexagonal honeycomb cell arrays 5. Adjacent low-stress zones 2 and high-stress zones 3 are gradient connected by a transition section 6 formed by an axially distributed hexagonal honeycomb cell array 5.

[0026] The hexagonal cell array 5 is composed of hexagonal cell array 8, the side length of which ranges from 0.5 to 10 mm and can be adjusted according to load requirements.

[0027] The dimensions of the hexagonal honeycomb unit 8 vary continuously along the radial or axial direction of the reinforcing rib body 1;

[0028] Among them, the density gradient of the radially distributed hexagonal honeycomb cell array 5, the size of the hexagonal honeycomb cell 8 increases radially outward from the center of the reinforcing rib body 1, is used to achieve ultra-strong stress intensity inside the reinforcing rib body 1.

[0029] The density gradient of the axially distributed hexagonal honeycomb cell array 5, along the direction from high stress region 3 to low stress region 2, gradually reduces the size of the hexagonal honeycomb cell 8 to be consistent with the size of the hexagonal honeycomb cell 8 in low stress region 2. Similarly, the size of the hexagonal honeycomb cell 8 at the transition section 6 on one side of high stress region 3 is consistent with that at high stress region 3, which is used to realize the gradual connection of stress between high stress region 3 and low stress region 2.

[0030] By adopting a simulated honeycomb topology structure, the strength of the reinforcing rib body 1 is increased while the overall mass is significantly reduced.

[0031] In this embodiment of the invention, the thickness of the hexagonal honeycomb unit 8 in the high-stress region 3 is greater than the thickness of the hexagonal honeycomb unit 8 in the low-stress region 2.

[0032] Specifically, the thickness of the hexagonal honeycomb unit 8 in the high-stress zone 3 is set to 0.3-1.5 mm, and the thickness of the hexagonal honeycomb unit 8 in the low-stress zone 2 is set to 0.1-0.3 mm, in order to further increase the stiffness of the high-stress zone 3.

[0033] In one embodiment of the present invention, a dense connecting section 4 is provided at the connection between the reinforcing rib body 1 and the external structure. The size of the hexagonal honeycomb unit 8 of the dense connecting section 4 is reduced to less than 1 mm, or directly degenerated into a solid grid to ensure stability when connected to the external structure.

[0034] In a preferred embodiment of the present invention, the cell wall connection points of the hexagonal honeycomb unit 8 are rounded (R≥0.2mm) to avoid stress concentration in additive manufacturing;

[0035] At the same time, a minimum wall thickness of ≥0.1mm is required to ensure manufacturability.

[0036] In a preferred embodiment of the present invention, the outer metal layer 7 may be made of titanium alloy, high-strength aluminum alloy or metal composite material;

[0037] Among them, titanium alloys have low density, high strength, and excellent corrosion resistance;

[0038] High-strength aluminum alloys have a specific strength close to that of titanium alloys, cost only 1 / 3 of that of titanium alloys, and have excellent processing performance;

[0039] Metal composite materials generally refer to: matrix: 6061 aluminum alloy;

[0040] Reinforcing phases: SiC particles (15-20 vol%), carbon nanotubes (CNTs), which increase stiffness by 40%; excellent thermal stability;

[0041] The specific choice depends on the actual usage requirements, and will not be elaborated on here.

[0042] It should be understood that all components in this application are made of metal or plastic materials with adaptable strength in the relevant field to ensure that their structural rigidity meets actual requirements.

[0043] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A lightweight gradient reinforcing rib with a simulated honeycomb topology, characterized in that, It includes a reinforcing rib body (1), a metal outer layer (7) covering its outer side, and a hexagonal honeycomb cell array (5) filling the inner side of the metal outer layer (7). The reinforcing rib body (1) is divided into a low-stress area (2) and a high-stress area (3), which are connected by a transition section (6) with an axial gradient distribution. The cell size of the hexagonal honeycomb cell array (5) increases from the center to the outside in the radial direction, and decreases from the high-stress area (3) to the low-stress area (2) in the axial direction.

2. The lightweight gradient stiffener of the cellular-like topology structure according to claim 1, characterized in that: The wall thickness of the hexagonal honeycomb unit (8) in the high-stress region (3) is 0.3–1.5 mm, and the wall thickness of the unit in the low-stress region (2) is 0.1–0.3 mm.

3. The lightweight gradient stiffener of the cellular-like topology structure according to claim 1, characterized in that: The reinforcing rib body (1) is provided with a dense connecting section (4) at the connection between it and the external structure, and its honeycomb unit size is <1mm or degenerates into a solid grid.

4. The lightweight gradient stiffener of the cellular-like topology structure according to claim 1, characterized in that: The cell wall connection points of the hexagonal honeycomb unit (8) adopt rounded transitions, and the minimum wall thickness is ≥0.1mm.

5. The lightweight gradient stiffener of the cellular-like topology structure according to claim 1, characterized in that: The outer metal layer (7) is made of titanium alloy, high-strength aluminum alloy or metal composite material.

6. The lightweight gradient stiffener of the cellular-like topology structure according to claim 1, characterized in that: The hexagonal honeycomb unit (8) has a side length of 0.5–10 mm and its size is adjustable.

7. The lightweight gradient stiffener of the cellular-like topology structure according to claim 1, characterized in that: The cell size of the transition section (6) is consistent with that of the adjacent high-stress area (3) or low-stress area (2).

Images